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Apparatus and method for monitoring and controlling heating and/or cooling systems

  • US 4,903,759 A
  • Filed: 09/25/1987
  • Issued: 02/27/1990
  • Est. Priority Date: 09/25/1987
  • Status: Expired due to Fees
First Claim
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1. In an apparatus for changing the temperature of air in a conditioned space and having a first temperature sensor for sensing the temperature of air in the conditioned space and a temperature modifying unit for circulating a flow of air through the conditioned space and changing the temperature of the flowing air, the unit being operatively connected with and responsive to the first temperature sensor, an improved system for monitoring the efficiency of operation of the apparatus and comprising:

  • second and third temperature sensors for sensing the temperature of circulating fluids;

    said second temperature sensor sensing the temperature of a supply fluid circulated to said temperature modifying unit;

    said third temperature sensor sensing the temperature of a return fluid circulated from said temperature modifying unit;

    processor means operatively connected with and responsive to said temperature sensors for comparing the temperatures sensed by said second and third temperature sensors and determining the temperature differential therebetween and the percentage of a predetermined optimum differential between the sensed return air and supply air temperatures which has been attained and generating a percentage signal representative of such percentage; and

    annunciator means operatively connected with said processor means and responsive to the generation of a percentage signal for displaying a visual indication of such percentage.

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